Correction, the T2 hangar is still standing amongst all the new buildings. Two wartime buildings also survive, I believe one was an admin block and one a store. There are also two pill boxes just north of the Aeropark. Most of the bomb dump track remains but there is very little in terms of structure, just piles of rubble and the odd bit of wall.
There's a good aerial shot on Bird's Eye Wartime Leicestershire by Terence Cartwright and another in the Roy Bonser book. As for wartime shots of buildings, these are like hens' teeth.